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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecce83b1c35d1006051ff6d2efb47eee75a291c0bd6cbe6629f7db84de721a6f' 
  AND token = 'nTTFWKUyDdvon2lmfS4iUOUzUCc+9H/JdcoK3onB+Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}